A treatise on surveying, comprising the theory and the practice (1906)
Gillespie, William Mitchell, 1816-1868, Staley, Cady, 1840- · New York D. Appleton · leaf 240
the arc of a circle. A T and B T are tai.geuts to this curveat A and B respectively, a = 180°-(^i + A^0/8 = 180°-(4 + A4)Since the curve A B differs but littlefrom the arc of a circle, we can make A Ci = nil ^, A^ = r/?21/.,where m-i and ?^^2 are called coefficients of refraction. Hence the… … 230 TRIGONOMETRIC LEVELINO. If a number of such results are obtained in any locality, and theweighted mean be taken, the result is considered the coefficient ofrefraction for that locality. To find the Coefficient of Refraction.—1. From the geometricalrelations of Fig. 476 we have ^, + A^i + ^o +…
Surveying
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
